Max Size: 10cm

Assam Danio (Devario assamensis)

Assam Danios are active, reasonably hardy and friendly fish making them an excellent addition to a peaceful community aquarium, especially if you already keep larger species. However, these Danios are among the biggest and require a large aquarium with plenty of swimming space. These Danios prefer cooler temperatures and do not have specific needs when it comes to water parameters, so they are suitable for the beginner aquarist, providing they have a large enough aquarium.

Assam Danios are a shoaling species in nature; therefore, it would be better to maintain them in groups of six or more individuals. Keeping these fish in more significant numbers will not only help to contain any aggression towards other inhabitants as the fish will be concentrating on maintaining their hierarchical rank within the group, but the males will also exhibit better colours in the presence of rival males.

Suitable tankmates for these Danios could include medium to large-sized Danios, Characins, Barbs and Rasboras, as well as peaceful Cichlids, Catfish, and Loaches. However, it would be better to avoid smaller species as they may be seen as a snack or slow-moving species as they may feel nervous around these active fish.

The ideal aquarium setup for these Danios would be one that resembles a flowing river or stream with a substrate of smooth rocks or boulders and some fine gravel or sand. You can further furnish the aquarium with driftwood roots or branches and some hardy aquatic plants such as Bolbitis, Anubias or Microsorum.

The aquarium will need to be well oxygenated and have a reasonable flow rate as these fish will enjoy swimming against the current; therefore, adding a powerhead or an internal filter would be ideal.

Since these Danios naturally occur in pristine habitats, they are intolerant to the buildup of excessive organic waste. Therefore these fish require good water conditions to thrive, and you should never introduce them into a biologically immature aquarium. In addition, the aquarium will need a tight-fitting lid as these Danios are accomplished jumpers.

The Assam Danio has a yellowish-green body and a white abdomen. They possess two wide longitudinal reddish-orange stripes above the lateral line and two broken orangy-red stripes along their sides. These Danios have large mouths and eyes, and their caudal fin is forked. In addition, their pectoral, pelvic and anal fins are transparent; the caudal fin is reddish, and their dorsal fin is pinkish.


Assam Danio
Assam Danio
Quick Facts
Scientific NameDevario assamensis
Year Described1984
Other NamesAssamese Danio
Aquarium LevelMiddle - Top
DifficultyBeginner - Intermediate
Best kept asGroups 6+
Lifespan4 - 8 years
Water Parameters
Water TypeFreshwater
PH6.0 - 8.0
GH5 - 15
TDS36 - 215
59 - 71℉
15 - 21.7℃


In the home aquarium, the Assam Danio will readily accept most good quality dried foods such as granules, flakes and sinking pellets. These modern food products have been developed to provide all adequate nutrition to maintain your fish's health and dietary requirements.

Providing additional foodstuffs such as live, frozen, and freeze-dried meals such as bloodworm, daphnia, and tubifex once or twice a week will provide additional benefits to your fish's health and well-being but is not a must for this fish.

It should be noted that bloodworms should only be given as an occasional treat and should not be used as the staple diet as they are difficult for fish to digest and can potentially cause blockages.

This fish is an omnivore in the wild, meaning it will consume some vegetable matter. Although most modern fish foods take this into account and include them in their products, you can still supplement your fish's diet with blanched vegetables such as spinach, broccoli, and zucchini. Ensure you do not overfeed your fish and remove any leftovers the following day.

Tank Mates

1 interesting tank mate ideas for the Assam Danio could include:

Dwarf Gourami(Trichogaster lalius)

Sexual Dimorphism

It can be relatively hard to differentiate between male and female Assam Danios; however, the females are slightly larger than males, possess a more rounded abdomen and are duller than males. In contrast, males are usually smaller, slimmer, and more vibrantly coloured than females.

Other Danios of interest

Barred Danio(Devario pathirana)
Bengal Danio(Devario devario)
Black Barred Danio(Danio absconditus)
Blood Tailed Danio(Devario annandalei)
Blue Danio(Danio kerri)
Celestial Pearl Danio(Danio margaritatus)
View all Danios
Date Added: 03/03/2022 14:16:12 - Updated: 03/03/2022 14:37:24